Table 2.

The ¹H- and ¹³C-NMR (DMSO-d₆, 500 and 125 MHz) and HMBC assignment for 2.

Position	δC, Type	δC (J in Hz)	HMBC
1	126.4, CH	8.58, s	C-3, 4a, 9, 11
2	135.9, C	-
3	132.7, C	-
4	133.5, C	-
4a	152.5, C	-
5	102.9, CH	6.93, s	C-7, 8a, 9, 10a
6	150.7, C	-
7	144.6, C	-
8	108.6, CH	7.48, s	C-7, 8a, 9, 10a
8a	115.7, C	-
9	173.4, CO	-
9a	119.8, C
10a	154.5, C
11	199.2, CO
12	29.2, CH3	2.55, s	C-2, 11
13	201.3, CO	-
14	32.3, CH3	2.53, s	C-4, 13
2′	152.9, CH	8.13, s	C-3′, 4′, 8′a, 9′
3′	120.8, C	-
4′	173.7, CO	-
4′a	113.4, C	-
5′	107.9, CH	7.28, brs	C-4’, 6′, 7′, 8′a
6′	152.8, C	-
7′	145.0, C	-
8′	103.1, CH	6.94, s	C-4′, 6′, 7′
8′a	151.1, C